|
|
PDF ADL5304 Data sheet ( Hoja de datos )
| Número de pieza | ADL5304 | |
| Descripción | Logarithmic Converter | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de ADL5304 (archivo pdf) en la parte inferior de esta página. Total 32 Páginas | ||
|
No Preview Available !
Data Sheet
High Speed, 200 dB Range,
Logarithmic Converter
ADL5304
FEATURES
Optimized for very fast response at all input currents
Overall bandwidth of >4 MHz for inputs >1 μA
Bandwidth: 25 kHz at input of 1 nA and 350 kHz at 10 nA
10 decades of input range: 1 pA to 10 mA
Law conformance: ±0.25 dB from 100 pA to 100 μA
Log ratio or fixed-intercept operation
Precision voltage references and reference current
Adaptive photodiode (PD) bias for low dark current
Programmable log slope and intercept
Default log slope of 10 mV/dB at VLOG pin
Single- or dual-supply operation
APPLICATIONS
High accuracy optical power measurement
Wide range baseband log compression
Versatile detector for high speed APC loops
GENERAL DESCRIPTION
The ADL5304 is a high speed logarithmic converter with fast
response and low noise over a 200 dB (1 pA to 10 mA) measure-
ment range. The ADL5304 provides a nominal logarithmic slope of
10 mV/dB (200 mV/decade); other values are easily configured.
Logarithmic intercept can be programmed over a wide range
with the internal 100 nA current source or externally for log ratio
applications. The default intercept value of 3.162 fA places the
midpoint of the measurement range of 100 nA at VLOG = 1.5 V.
A single positive supply of 5 V is all that is required for operation
over a specified 1 pA to 3 mA input range. Dual-supply operation
extends the specified input current range to 10 mA.
The ADL5304 accepts two current inputs to the logarithmic
argument. The numerator input, INUM, flows in the collector of an
NPN transistor, connected in a feedback path around a low offset
JFET amplifier. The denominator current, IDEN, is treated in the
same way, which allows for log ratio operation. The input summing
nodes (INUM and IDEN) operate at a constant default voltage of
1.5 V. The VSM1 to VSM4 pins flank the INUM and IDEN inputs
to provide a guard voltage to minimize leakage currents.
Adaptive photodiode biasing is provided for optical measurements.
A monitor current 1.1 times INUM is output at the IMON pin, and
an external resistor, RMNTR, at 10 times the photodiode series
resistance (RS) applies a voltage across the photodiode that
1st order keeps the internal PD junction at 0 V to minimize
dark current.
The VLOG output is buffered and can be rescaled through
internal gain setting resistors. The internal ILOG varies from
−400 μA to +400 μA as INUM changes over 10 decades from 1 pA
to 10 mA. This corresponds to 0.5 V to 2.5 V at the VLOG pin
in the default configuration shown in Figure 1.
http://www.DataSheet4U.net/
Accurate 1.5 V (Pin 1P5V) and 2.0 V (Pin 2VLT) reference outputs
allow precise repositioning of the intercept using external resistors.
The ADL5304 is available in a 32-lead, 5 mm × 5 mm LFCSP
and specified for operation from −40°C to +85°C.
SIMPLIFIED BLOCK DIAGRAM
RMNTR
IMON
30
VNUM INNM 1P5V BSDC 2VLT VPOS
32 31 26 28 17 29
VSM1
2
MONITOR AND
PD BIAS
(1.1× INUM)
VSM2 1.5V
3
1.5V
2V
100nA
BIAS AND
VREF
DCBI
27
INPS
24
INMS
23
22 VLOG
INUM
4
IDEN 5
IREF 6
VSM3
7
VSM4 1.5V
8
9
VDEN
ADL5304
VNUM
ILOG
TEMPERATURE
COMPENSATION
VDEN
5kΩ
7.5kΩ
SCL1
21
5kΩ SCL2
20
19 SCL3
18 ACOM
COMM NMFS VNEG DNFS ACOM HFCP
10 11
INDN
12 13
1kΩ
14 15
1kΩ
16
Figure 1.
VNEG
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2011 Analog Devices, Inc. All rights reserved.
datasheet pdf - http://www.DataSheet4U.net/
1 page  
Data Sheet
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
VPOS
VNEG
Input Current to INUM, IDEN
Thermal Data, 2-Layer JEDEC Board No Air
Flow (Exposed Pad Soldered to PCB)
θJA
θJC
Maximum Power Dissipation (Exposed
Pad Soldered to PC Board)
Maximum Junction Temperature
Operating Temperature Range
Storage Temperature Range
Lead Temperature (Soldering 60 sec)
Rating
+6 V
−6 V
20 mA
61.6°C/W
1.2°C/W
0.6 W
125°C
−40°C to +85°C
−65°C to +150°C
300°C
ADL5304
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
http://www.DataSheet4U.net/
Rev. 0 | Page 5 of 32
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
Data Sheet
2.3
2.1
1.9
1.7
10nA TO 100nA
1.5
100nA TO 1µA
1.3
1µA TO 10µA
1.1
10µA TO 100µA
0.9
0.7 100µA TO 1mA
0.5 1mA TO 10mA
0.3
0
10 20 30 40 50 60
TIME (µs)
Figure 27. Pulse Response for IDEN in Decade Steps from 1 nA to 1 mA;
INUM = 100 nA
10m
1m
1.1µA TO 11µA
11µA TO 110µA
110µA TO 1.1mA
100µ
10µ
1µ
100n
0
20 40 60
TIME (µs)
Figure 28. IMON Pulse Response vs. INUM
80
5
+3σ
4 –3σ
3
2
1
0
–1
–2
–3
–4
–5
–40
–20
0
20 40 60 80
TEMPERATURE (°C)
Figure 29. Slope Drift vs. Temperature for 200 mV/dec
(3 σ to Either Side of Mean)
http://www.DataSheet4U.net/
ADL5304
10
+3σ
8 –3σ
6
4
2
0
–2
–4
–6
–8
–10
–40
–20
0
20 40 60 80
TEMPERATURE (°C)
Figure 30. Logarithmic Offset Drift vs. Temperature
(3 σ to Either Side of Mean)
250
200
150
100
50
0
–1.0
–0.5 0
0.5
INUM VOS (mV)
Figure 31. (VNUM − VSUM) Histogram at 25°C
1.0
250
200
150
100
50
0
1.496
1.498
1.500
1.502
1P5V VOLTAGE (V)
Figure 32. 1P5V Histogram
1.504
Rev. 0 | Page 11 of 32
datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 32 Páginas | |
| PDF Descargar | [ Datasheet ADL5304.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| ADL5303 | Low Cost Logarithmic Converter | Analog Devices |
| ADL5304 | Logarithmic Converter | Analog Devices |
| ADL5306 | 60 dB Range (100 nA to 100 UA) Low Cost Logarithmic Converter | Analog Devices |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |